Definition of mason:
(n) :
one whose occupation is to build with stone or brick; also, one who prepares stone for building purposes; a member of the fraternity of Freemasons. See
Freemason
(v) :
to build stonework or brickwork about, under, in, over, etc.; to construct by masons; -- with a prepositional suffix; as, to mason up a well or terrace; to mason in a kettle or boiler